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Filter cloth for filter press, belt press filter for plastic waste treatment in the injection molding industry
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Detailed Description
- Filter cloth for filter press Belt filter press for processing plastic waste in the injection molding industry
Filter press type: Belt filter press
Application industry: Injection molding
Material description: Plastic waste
In plastic waste recycling “ Unsung heroes ” ：Application of filter press filter cloth and belt filter press technology in the injection molding industry
In recent years, global plastic pollution and “ dual carbon ” The issue of resource recycling under the background is becoming increasingly prominent. As an important part of the plastics processing industry, The injection molding industry, while improving product quality and efficiency, also faces many challenges in reprocessing scraps, washing wastewater, and residue waste liquid. How to achieve green processing and resource recovery of these “ plastic waste ” has become the key to the green upgrading of the industry chain. In this process, a often overlooked but crucial link is playing a role —— Solid-liquid separation system, especially the filtration equipment system centered on filter press filter cloth and belt filter press 。
I. Waste challenges in the injection molding industry: Not only “ plastic ” ，but also “ water ” and “ residue ”
Injection molding processes typically include steps such as plastic raw material drying, heating, injection into molds, cooling, and demolding. The following types of waste are generated in the process:
- Wastewater ：Wastewater from raw material cleaning, scrap cleaning, and equipment cleaning containing grease and impurities
- Sludge / Sediment ：High-water-content impurities formed during wastewater sedimentation treatment or material crushing
- Mixed plastic particles or fine powder residue ：Including scraps that did not enter the finished product, and fine powder under the sieve
- Oily plastic slurry ：Oily emulsions and waste liquids formed in certain additive mixing processes
The traditional method is simple sedimentation + physical dewatering or landfill, which not only wastes resources but also fails to meet current environmental regulations.
II. Belt filter press: In plastic waste treatment “ Green separator ”
Compared with traditional processing methods, Belt filter press ( Belt Filter Press ) Due to its continuous, efficient, and energy-saving characteristics, it plays an increasingly important role in the treatment of plastic waste, especially in the separation of wastewater and waste liquid containing residue. 。
1. Working principle brief introduction:
The belt filter press adopts a multi-stage dehydration structure, mainly including a gravity dehydration zone, a wedge zone, and a pressing zone. The waste liquid is separated from the solid by roller pressing between the filter cloths.
2. Applicable to the following scenarios:
- Dewatering of remaining sludge after wastewater treatment of plastic cleaning line
- Separation of polymer impurities and grease in waste material crushing liquid
- Containing filler / Dewatering of high-water-content waste residue of additive residue
3. Advantages:
- Continuous operation, high efficiency ，suitable for large-scale plastic remanufacturing lines in injection molding plants
- Low energy consumption ，lower operating costs than centrifugal equipment
- Compact structure ，can be integrated into existing cleaning and recycling systems
III. Filter cloth: Key material affecting separation quality
In the belt filter press system, The filter cloth is not only part of the mechanical structure, but also directly determines the filtration accuracy, speed, and moisture content of the filter cake. Especially in the treatment of plastic waste, due to the complex composition of the materials, higher requirements are put forward for the performance of the filter cloth.
1. Core performance of filter cloth:
Requirements
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Description
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Chemical corrosion resistance
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To cope with the complex liquid components containing additives and plastic auxiliaries
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High peelability
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Prevent plastic fine particles from adhering to the fabric surface, facilitating automatic cake unloading
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High strength tensile resistance
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Withstand repeated tensioning and mechanical pressing
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Good permeability
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Ensure high-speed separation and improve processing efficiency
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Conclusion: Solid-liquid separation “ The power of details ” ，achieving a grand vision of plastic recycling
Filter cloths for filter presses and belt filter presses, while only a small part of the injection molding industry, directly affect whether plastic waste can truly be reduced, rendered harmless, and recycled. Their performance, structure, and durability determine whether companies can confidently enter “ the green injection molding ” era.
In “ dual carbon “ plastic reduction “ circular economy ” and other multiple goals, the future plastics processing industry will not only compete in molding technology and product processes, but also in the construction of resource closed-loop and green systems. Those previously overlooked “ filtration details ” are becoming key technological fulcrums for building a sustainable industrial system.
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